<strong><span style="color:#ff0000;">【XML幫助類】C#xml創(chuàng)建修改讀取刪除幫助類XmlHelper.cs <a target=_blank href="http://bbs.cskin.net/forum.php?mod=viewthread&tid=189&fromuid=2446">http://bbs.cskin.net/forum.php?mod=viewthread&tid=189&fromuid=2446</a> (出處: CSkin論壇) 介紹： </span></strong> 一個(gè)很好用的Xml幫助類，包含創(chuàng)建文件，創(chuàng)建節(jié)點(diǎn)，獲取指定XPtah表達(dá)式的節(jié)點(diǎn)的值，刪除指定節(jié)點(diǎn)等等，需要引用命名空間System.Xml。using System.Xml; using System.Data;namespace HelloCsharp.Utilities {/// <summary>/// Xml的操作公共類/// </summary> public class XmlHelper{#region 字段定義/// <summary>/// XML文件的物理路徑/// </summary>private string _filePath = string.Empty;/// <summary>/// Xml文檔/// </summary>private XmlDocument _xml;/// <summary>/// XML的根節(jié)點(diǎn)/// </summary>private XmlElement _element;#endregion#region 構(gòu)造方法/// <summary>/// 實(shí)例化XmlHelper對(duì)象/// </summary>/// <param name="xmlFilePath">Xml文件的相對(duì)路徑</param>public XmlHelper(string xmlFilePath){//獲取XML文件的絕對(duì)路徑_filePath = SysHelper.GetPath(xmlFilePath);}#endregion#region 創(chuàng)建XML的根節(jié)點(diǎn)/// <summary>/// 創(chuàng)建XML的根節(jié)點(diǎn)/// </summary>private void CreateXMLElement(){//創(chuàng)建一個(gè)XML對(duì)象_xml = new XmlDocument();if (DirFileHelper.IsExistFile(_filePath)){//加載XML文件_xml.Load(this._filePath);}//為XML的根節(jié)點(diǎn)賦值_element = _xml.DocumentElement;}#endregion#region 獲取指定XPath表達(dá)式的節(jié)點(diǎn)對(duì)象/// <summary>/// 獲取指定XPath表達(dá)式的節(jié)點(diǎn)對(duì)象/// </summary> /// <param name="xPath">XPath表達(dá)式,/// 范例1: @"Skill/First/SkillItem", 等效于 @"//Skill/First/SkillItem"/// 范例2: @"Table[USERNAME='a']" , []表示篩選,USERNAME是Table下的一個(gè)子節(jié)點(diǎn)./// 范例3: @"ApplyPost/Item[@itemName='崗位編號(hào)']",@itemName是Item節(jié)點(diǎn)的屬性./// </param>public XmlNode GetNode(string xPath){//創(chuàng)建XML的根節(jié)點(diǎn)CreateXMLElement();//返回XPath節(jié)點(diǎn)return _element.SelectSingleNode(xPath);}#endregion#region 獲取指定XPath表達(dá)式節(jié)點(diǎn)的值/// <summary>/// 獲取指定XPath表達(dá)式節(jié)點(diǎn)的值/// </summary>/// <param name="xPath">XPath表達(dá)式,/// 范例1: @"Skill/First/SkillItem", 等效于 @"//Skill/First/SkillItem"/// 范例2: @"Table[USERNAME='a']" , []表示篩選,USERNAME是Table下的一個(gè)子節(jié)點(diǎn)./// 范例3: @"ApplyPost/Item[@itemName='崗位編號(hào)']",@itemName是Item節(jié)點(diǎn)的屬性./// </param>public string GetValue(string xPath){//創(chuàng)建XML的根節(jié)點(diǎn)CreateXMLElement();//返回XPath節(jié)點(diǎn)的值return _element.SelectSingleNode(xPath).InnerText;}#endregion#region 獲取指定XPath表達(dá)式節(jié)點(diǎn)的屬性值/// <summary>/// 獲取指定XPath表達(dá)式節(jié)點(diǎn)的屬性值/// </summary>/// <param name="xPath">XPath表達(dá)式,/// 范例1: @"Skill/First/SkillItem", 等效于 @"//Skill/First/SkillItem"/// 范例2: @"Table[USERNAME='a']" , []表示篩選,USERNAME是Table下的一個(gè)子節(jié)點(diǎn)./// 范例3: @"ApplyPost/Item[@itemName='崗位編號(hào)']",@itemName是Item節(jié)點(diǎn)的屬性./// </param>/// <param name="attributeName">屬性名</param>public string GetAttributeValue(string xPath, string attributeName){//創(chuàng)建XML的根節(jié)點(diǎn)CreateXMLElement();//返回XPath節(jié)點(diǎn)的屬性值return _element.SelectSingleNode(xPath).Attributes[attributeName].Value;}#endregion#region 新增節(jié)點(diǎn)/// <summary>/// 1. 功能：新增節(jié)點(diǎn)。/// 2. 使用條件：將任意節(jié)點(diǎn)插入到當(dāng)前Xml文件中。/// </summary> /// <param name="xmlNode">要插入的Xml節(jié)點(diǎn)</param>public void AppendNode(XmlNode xmlNode){//創(chuàng)建XML的根節(jié)點(diǎn)CreateXMLElement();//導(dǎo)入節(jié)點(diǎn)XmlNode node = _xml.ImportNode(xmlNode, true);//將節(jié)點(diǎn)插入到根節(jié)點(diǎn)下_element.AppendChild(node);}/// <summary>/// 1. 功能：新增節(jié)點(diǎn)。/// 2. 使用條件：將DataSet中的第一條記錄插入Xml文件中。/// </summary> /// <param name="ds">DataSet的實(shí)例，該DataSet中應(yīng)該只有一條記錄</param>public void AppendNode(DataSet ds){//創(chuàng)建XmlDataDocument對(duì)象XmlDataDocument xmlDataDocument = new XmlDataDocument(ds);//導(dǎo)入節(jié)點(diǎn)XmlNode node = xmlDataDocument.DocumentElement.FirstChild;//將節(jié)點(diǎn)插入到根節(jié)點(diǎn)下AppendNode(node);}#endregion#region 刪除節(jié)點(diǎn)/// <summary>/// 刪除指定XPath表達(dá)式的節(jié)點(diǎn)/// </summary> /// <param name="xPath">XPath表達(dá)式,/// 范例1: @"Skill/First/SkillItem", 等效于 @"//Skill/First/SkillItem"/// 范例2: @"Table[USERNAME='a']" , []表示篩選,USERNAME是Table下的一個(gè)子節(jié)點(diǎn)./// 范例3: @"ApplyPost/Item[@itemName='崗位編號(hào)']",@itemName是Item節(jié)點(diǎn)的屬性./// </param>public void RemoveNode(string xPath){//創(chuàng)建XML的根節(jié)點(diǎn)CreateXMLElement();//獲取要?jiǎng)h除的節(jié)點(diǎn)XmlNode node = _xml.SelectSingleNode(xPath);//刪除節(jié)點(diǎn)_element.RemoveChild(node);}#endregion //刪除節(jié)點(diǎn)#region 保存XML文件/// <summary>/// 保存XML文件/// </summary> public void Save(){//創(chuàng)建XML的根節(jié)點(diǎn)CreateXMLElement();//保存XML文件_xml.Save(this._filePath);}#endregion //保存XML文件#region 靜態(tài)方法#region 創(chuàng)建根節(jié)點(diǎn)對(duì)象/// <summary>/// 創(chuàng)建根節(jié)點(diǎn)對(duì)象/// </summary>/// <param name="xmlFilePath">Xml文件的相對(duì)路徑</param> private static XmlElement CreateRootElement(string xmlFilePath){//定義變量，表示XML文件的絕對(duì)路徑string filePath = "";//獲取XML文件的絕對(duì)路徑filePath = SysHelper.GetPath(xmlFilePath);//創(chuàng)建XmlDocument對(duì)象XmlDocument xmlDocument = new XmlDocument();//加載XML文件xmlDocument.Load(filePath);//返回根節(jié)點(diǎn)return xmlDocument.DocumentElement;}#endregion#region 獲取指定XPath表達(dá)式節(jié)點(diǎn)的值/// <summary>/// 獲取指定XPath表達(dá)式節(jié)點(diǎn)的值/// </summary>/// <param name="xmlFilePath">Xml文件的相對(duì)路徑</param>/// <param name="xPath">XPath表達(dá)式,/// 范例1: @"Skill/First/SkillItem", 等效于 @"//Skill/First/SkillItem"/// 范例2: @"Table[USERNAME='a']" , []表示篩選,USERNAME是Table下的一個(gè)子節(jié)點(diǎn)./// 范例3: @"ApplyPost/Item[@itemName='崗位編號(hào)']",@itemName是Item節(jié)點(diǎn)的屬性./// </param>public static string GetValue(string xmlFilePath, string xPath){//創(chuàng)建根對(duì)象XmlElement rootElement = CreateRootElement(xmlFilePath);//返回XPath節(jié)點(diǎn)的值return rootElement.SelectSingleNode(xPath).InnerText;}#endregion#region 獲取指定XPath表達(dá)式節(jié)點(diǎn)的屬性值/// <summary>/// 獲取指定XPath表達(dá)式節(jié)點(diǎn)的屬性值/// </summary>/// <param name="xmlFilePath">Xml文件的相對(duì)路徑</param>/// <param name="xPath">XPath表達(dá)式,/// 范例1: @"Skill/First/SkillItem", 等效于 @"//Skill/First/SkillItem"/// 范例2: @"Table[USERNAME='a']" , []表示篩選,USERNAME是Table下的一個(gè)子節(jié)點(diǎn)./// 范例3: @"ApplyPost/Item[@itemName='崗位編號(hào)']",@itemName是Item節(jié)點(diǎn)的屬性./// </param>/// <param name="attributeName">屬性名</param>public static string GetAttributeValue(string xmlFilePath, string xPath, string attributeName){//創(chuàng)建根對(duì)象XmlElement rootElement = CreateRootElement(xmlFilePath);//返回XPath節(jié)點(diǎn)的屬性值return rootElement.SelectSingleNode(xPath).Attributes[attributeName].Value;}#endregion#endregionpublic static void SetValue(string xmlFilePath, string xPath, string newtext){//string path = SysHelper.GetPath(xmlFilePath);//var queryXML = from xmlLog in xelem.Descendants("msg_log")// //所有名字為Bin的記錄// where xmlLog.Element("user").Value == "Bin"// select xmlLog;//foreach (XElement el in queryXML)//{// el.Element("user").Value = "LiuBin";//開始修改//}//xelem.Save(path);}} }

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